My affiliate account wasn't approved by a merchant, now what?

Merchants decide not approve affiliates into their program for a variety of reasons:

Lack of sales

Lack of content on site

Site niche does not match merchant's niche

etc...

If a merchant has declined your application, you can try reaching out to them and inquiring why your application was rejected. You could also explain what your marketing plan is and how you intend to promote them.